Periodic table organization

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Across
  1. 2. a pure substance all atoms have the same # of protons, and the element cannot be broken
  2. 6. exhibit great stability & extremely low reaction rates
  3. 8. dull insulators, brittle (in the right direction of periodic table)
  4. 9. a one-or-two-letter abbreviation for chemical elements name
  5. 11. you use this strategy to find the # of neutrons, # of protons, # of electrons
  6. 12. a column in the periodic table (there are 18)
Down
  1. 1. to the tendency of a metal to react with chemicals in its surroundings
  2. 3. Luster, malleable, and ductile (in the left direction of periodic table)
  3. 4. the quantity of matter contained in an atom of an element
  4. 5. a row in the periodic table
  5. 7. the atomic # is the # of protons in the nucleus of an atom
  6. 10. has properties between metals and non-metals, and is a semi-conductor